Multiple unit turret type machine tool



March 15, 1932. w. K. MILLHOLLAND MULTIPLE UNIT 'I'URRE'I' TYPE Adi-IINE TOOL I5 Sheets-Sheet 2 w: E g a w E M L 5Q u -1 H M I.

.4 TTORNE Patented Mar. 15, 1932 UNITED STATES K. IIILLHOLLAND, OF INDIANAPOLIS, INDIANA MULTIPLE UNIT TURRET TYPE TOOL Application filed February 1, 1930. Serial No. 425,141.

This invention relates to a semi-automatic machine embodying a plurality of substantially independent power operable units arranged to successively operate upon pieces of work presented in succession thereto.

One object of the invention is to permit a single operator to manually control a machine ot' the character indicated so that the machine can be loaded and'unloaded and m started as desired.

Another object of the invention is to insure substantially simultaneous initiation of all of the units of the machine through a single remote control apparatus.

Another object of the invention is to improve a machine unit of the character set forth in the co-pending application Serial No. 172,148 of which this application is a continuation in part. I

This application is an extension of the before mentioned application in that thetype of feed is positive; the type of control is of a lit remote character and the cam and lock asso-' ciated therewith is positive.

The full nature of the invention will be understood by the accompanying drawings and the following description and claims:

In the drawings Fig. 1 is a perspective view of the major portion of the machine showing a plurality of units arranged in dif ferent positions and at difl'erent stations, the

forepart of the figure representing the loading and unloading and control station. Fig. '2 is an elevational view of a horizontal unit illustrated in Fig. 1 parts being broken away and shown in section to show the details of the unit. Fig. 3 is a transverse sectional view taken on line 33 of Fig. 2. Fig. 4 is an end View of the'nnit looking toward the tool end of the same. Fig. 5 is a transverse sectional view taken on line 5- 5 of Fig. 3 and in the direction of the arrows. \Figfifi is a transverse sectional view taken on line 6 6 of Fig. 2 and'in the direction of the arrows.'

Fig. 7 is a horizontal sectional view taken on line 7 7 of Fig. 2 and in the direction of the arrows. Fig. 8 is a vertical sectional view taken on line 8-8 of Fig. 4 and in the/direction of the arrows.

In Fig. 1 of the drawings 10 indicates the base of a machine, 11 a rotatable table, the rotation of which may be controlled by or even actuated by the lever 212 so that the table may be indexed a predete'rminedangular distance at each operation of the lever. The table 11 is provided with a plurality of work holding chucks 12 each of which is controlled by a shaft 13 mounting a manually cont-rolled lever 14:. The work operated upon is manually positioned in the Work holders and similarly removed therefrom and at the same station. Each of the work holders is detachably mounttd as at 16upon the table and herein six wort: holders are provided and are arranged to hold and grip the work so that different operations may be performed thereon while mounted in the holder.

Extending laterally of the base 10 is a supporting portion 17 upon which is mounted the bed 18 and said bed detachably supports a base plate 19 of a multiple drill unit indicated generally by the numeral 20. A sup-- port 21 at station No. 3 detachably supports a rest and guide 22 and also a unit indicated generally by the letter A. Adjacent thereto is another supporting portion. 23 that also supports a guide 24 associated with a unit B. Unit A includes a drill 25 while unit B mounts a reamer 26. These operate upon the horizontal top face of the work while the 8g drill 27 of theunit at the foreground, the head20 of which only is illustrated, is adapted to operate upon the vertical face of the Work.

A supporting portion 28 supports the unit 35 C which in the present invention includes an extension head 29 that .terminates in a milling cutter 30 for milling the top of the work. I The portion 31 of the main frame supportsthe base. 32 which supports the multiple head 0 33 of the last unit and said head is guided by the guide portion 34 and terminates in the tapping. portions 35 for tapping certain of the openings in the vertical face of the work. Each of the units mounts an air cylinder 36 which is connected by the conduit 37 to the common line38, see the lower right hand portion of Fig. 1. Said line 38 is connected to the pressure supply line 39 by a valve construction 40 controlled by lever 41. In certain instances additional air pressure is constantly supplied by the lines 42 to power return and stop anchoring cylinders 43 see units B and C.

The operation in general of the machine is' as follows: In the foreground the work holder is opened by operating lever 14 and the finished work is removed and a work blank is inserted. Lever 14 is then tilted to lock the work in the holder. Handle 212 is'then 0perated for indexing the work to the first sta 'tors continuously rotate the tools associated therewith. When the master control lever 41 is actuated pressure is supplied to the several starting cylinders 36 controlling the respective units and thereupon the clutch mechanisms simultaneously connect all of the feeding or tool advancing mechanisms to the source of power so that all of the tools are simultaneously moved into work engagement for working and while rotating.

The time cycle of indexing of course is determinable by the operation that requires the longest interval. The time cycle of each unit as set forth in the co-pending application before mentioned is determinable by the control cam so that the forward-feeding of the respective tools is automatically disconnected from the power and the tool is retracted. This retraction may be by weight action or may be by pneumatic action, or may be by spring or counter weight action and pneumatic action or may be by either and its extreme retracted travel is cushioned by' pneumatic action or spring action or both, and further travel of the tool thereupon ceases until the fmward'feeding mechanism is again actuated by remote control obtained through actuation of lever 41.

When the unit whose time cycle is the longest completes its cycle the operator again actuates lever 41 to again and simultaneously initiate all of the time cycles. During'the-operation of all of the units the operator opens the chuck of the work holder at the loading and unloading station, removes the completed work and inserts the blank to be operated upon.

The advantage of having manualindexing is that the rate of indexing is determined by the speed of the operator in changing blanks or work. Likewise manual indexing permits the operator to stop all the units in order to replace any broken tool should that unfortunately occur. The co-pending application machine as pointed out and the, same apspring or counter plies to the present disclosure discloses that breakage in tools is reduced to a minimum because the feeding of the tool is determinable by the cam in each unit so that the feeding of the tool toward and into the work is at the most economical'rate of operation consistent with tool consumption and power consumption and excellence of workmanship or machining.

Fig. 1, therefore, illustrates but one form of a multiple unit machine all of the units being simultaneously controlled for the simultaneous operation of the units upon successive pieces of work and as illustrated the units need not necessarily be confined to operate upon the work in the same general relationship but may be ositioned radially of or parallel to the axis 0 work rotation. Likewise the units may operate transverse to a plane intermediate a horizontal plane or a vertical plane. have been built in which the base portions supporting the units have been inclined at an angle to the work table and this angularity may be in a radial plane or in a plane between that and a tangent plime.

It will be observed from Fig. 1 that practically all of the units disclosed therein are associated with a supporting base portion of the machine which det achably supports a ide construction in turn' slidably supportng an operatingffliad that mounts the tool and interposed hiptween the same are separating springs; It will likewise be observed from this figure that each of the units is detachably .moun ted upon ways formed in the supporting portions'of the machine and it will blefurthermore ob rved that some of'the units "are provided with ways upon the upper face parallel to the supporting base portions that are mounted in and upon the ways of the inachine sup orting portions referred to. Since all of tlie units except for a change of head construction to accommodate different types of tools aresubstantially identical a brief description of the particular unit illustrated in Flgs. 2 to 8 inclusive will -it is believed sufiice for an understanding of all of the units illustrated and the various modifications thereof that are fpossible and within the scope of this inventio In Figs. 2 to 8 inclusive there is-illustrated in detail one form of one of the units. 50 indicates the base of the machine having acentral bore 51 therein parallel to a lower way construction 52 and a parallel upperway construction 53. The lower way construction 52 is arranged for mounting upon the bed of the machine or an extension thereof. The upper way construction'53 is arranged for mounting an auxiliary attachment that may be in the nature of a boring bar or auxiliary head support, or as shown herein in the nature of a power and cushioning device. The same constitutes the cylinder 43 constantly supplied In other words, machines and 33-are supported, and these in turn as f i llustrated in Fig. 1 are slidably supported upon parallel bars or rods mounted in the auxiliary frameworks 19, 22, 24 and 34 respectively.

Mounted in the bore 51 is a rotatable and reciprocable spindle 59 which terminates in its forward end in a portion 60to which or by which the tool is attached. The spindle 59' has a multiple splined connection 61 with av sleeve 62 and said sleeve is associated with the rear end and splined end of said spindle and includes upon its exterior periphery a worm formation 63 for meshing with a worm wheel 64, the same being shown in Fig. 6 and con-' stituting a source of power for power projection or forward feeding of said spindle through mechanism hereinaftercset forth.

The frame 50 rotatably supports the-worm forming sleeve 63 and upon the outer projecting end thereof, see Fig. 2, is keyed a gear 65 which meshes with a pinion 66 carried by a motor shaft 67 of a motor indicated generally by the numeral 68 and shown in Fig. 2, said motor frame being suitabl secured to the.

unit frame 50 as at 69. ny desired gear change set may be substituted for that illustrated, and in'place of a pair of gears a multiple gear train may be employed ifdesired.

To axially adjust the throw of the spindle 59 the head 57 includes a sleeve extension 70 that rotatably supports said spindle. The sleeve extension 7 0 is exteriorly threaded as at 71 to receive an adjustingcollar 72 near'the forward end of the extension. A lock collar 73 is secured thereto as at 74 and is secured as at 75 to a sleeve 76, said sleeves having telescopic and s lined connection as indicated at 77. Sleeve 6 is likewise splined or has a keyed connection 78 with a sleeve 80, the same forming the bearing within the bore 51 for the spindle construction, said bearing being secured therein by the screws 81 which also lock the bearing against axial or rotative movement and also serve to anchor the key 78 that forms the splined connection betweenv said bearing and the outer adjusting sleeve 76.

The sleeve 76 includes two depending spaced cars 82 which mount in 83, see Figs. 2 and 3, in turn mounting t erebetween the link 84. Said link 84 is supported at its opposite end by lever 85 pivotally supported by the shaft 86, see Figs. 2and 3. The pivotal support 87 between the link and the lever incl udes a roller or cam follower 104, the same being adaptedto engage cam 103, see Figs.

65 2 and 5. Cam 103, in the rotation thereof through means hereinafter specified, serves to project the spindle constructionforwardly toward the left from: the unit in opposition to the several springs interposed between the forward auxiliary guide and the head construction, see Fig. 1 in opposition to the pneumatic pressure in the cylinder 43, see Figs. 1 and 2. Upon the cam reaching its extreme position corresponding to the extreme forwardly fed position of the spindle the springs if employed, or the air pressure in cylinder 43 if provided, or both, or a counter-weight if utilized therewith or substituted therefor, serves to automatically return the spindle to the retracted or nonworking position. Spring 9 may be associated with lever 85 to return the work holder upon proper positioning of the cam permitting such movement. a

It will of course be understood that this retractive movement at the end may be cushioned by a cushion spring or by a dash pot construction and the same is herein illus tratod in the upper portion of Fig. 2. The air cylinder 43 includes a closure 87 which has av port 88 therethrough and the cap 89 includes a port 90 therein. Closure 87 forms one end of the dash pot. Piston 54 forms the piston therefor. A threaded stem 91 is I provided by which the position of piston 87 is adjusted so thatthe desired dash pot actionis obtained and the adjustment is fixed by set screw 92 or the like.

Thepower supplied to the worm wheel 64, see -Fig.6, is transmitted through-a splined connection to a clutch collar 93 slidably supported on a shaft 94. Said collar is axially shiftable "on shaft 94 and has the clutch toothed facing 95for engagement with the clutch as rigid with said shaft 94. which in turn mounts the gear 97. Gear 97 meshes with gear 98 and the latter is keyed to a sleeve-like collar 99, see Figs. 5 and 7, which through the spring clutch construction 100 is associated with collar 101 carried by shaft 102. Mounted on shaft 102 is the cam 103 which engages. the follower 104.

' Concentric with said cam and mounted 0 said shaft is an automatic control in the form of a dog 105, see Fig. 2. The power supplied through the clutch 9596 causes reciprocation of the tool through the cam and follower connection 103104. Should an obstruction be encountered or should the rate of feeding be excessive, to prevent breakage of the device, the relief clutch 99100101 is provided and the collars will have relative rotative movement in that event, and thus forward feedingpf the spindle will not occur beyond a predetermined pressure.

Movement of the clutch into power transmitting position and automatic disengagement thereof is obtained through mechanism illustrated most clearly in Figs. 2, 6 and 7.

Means for initiating or starting the machine 111 normally retains the plunger and piston in the retracted or elevated position. Whenpressure is supplied to line 37 and therefore cylinder 36, and the same is supplied to all of the-cylinders simultaneously by depressing lever 41 of the valve construction. 40, see

Fig. 1, the plunger is depressed in opposition to spring 111 and the lever is tilted counter-clockwise. Lever 106 mounts an extension 112 whichpermits manual tilting of said lever. Said lever terminates in a pin 113 which rides in a slot 114 of a reciprocating bar or rod 115. Counter clockwise movement of the lever 106 serves to project, see Fig. 2, the block 116 toward the right in opposition to spring 117 and a spring 118 interposed between said rod and a stem 119 telescopically mounted at one end within the latter.

Rod 119 mounts block 120 which supports a bolt 121 concentric with which isthe spring 117. Block 120 pivotally supports the latch or pawl 122 at 123 and the toothed portion 124 thereof is engaged by the ex osed end of dog 105so that in rotation 0 said dog the block ,122 is moved toward the left in opposition to springs 117 and 118 for moving the rod'119 to the left for the purpose of disconnecting the power to the'forward feeding mechanism, in other words for disengaging the clutch. In this forward movement of the block 120 the pawl 122 rides-upon the pin 126. The pawl 122 thus is maintained in the elevated position by the pin or bearing surface 126 carried by block 116.

Counter clockwise tilting of lever 106 moves the block 116, and the rod 119 by abutting contact, and to the right and in this movement the pawl 1'22 moves relative to the lockout surface 126 so that the groove 127 permits the pawl to drop which releases the dog 105 from the abutment 124 of said pawl permitting the dog 105 and the supporting shaft 102 to rotate when the shaft and the cam rotates for reciprocating the spindle construction. Shaft 102 starts to rotate as soon as power is supplied to the same.

The power is supplied to the shaft 102 as before described when the clutch shifting yoke 128' riding in groove 129 of clutch collar. 95 is shifted toward the gear 97 in opposition to spring 130 concentric with the transverse shaft or clutch lever support 131. Clutch lever support 131 terminates in a cam face 132 which is engaged by the cam portion 133 of the actuating rod 119, seeFigs. 6 and 7 When the rod is projected toward the right the support 131 is projected trans versely thereof and into clutch engaging position. A rocker 134 is suitably supported upon a pivot support 136 and when support 131 is moved into the position shown in Figs. 6 and 7 an auxiliary support 137 is moved oppositely and the tapered end 138 thereof engages in another cam portion or groove 139 of rod 119. Rod 119 is thus maintained in the position shown in Fig. 7 even after pressure is removed from lever 106, see Fig. 2. The support member 131 is then held in the clutch engaging position and the plunger 137 is seated in groove 139 to lock the rod 119 in said clutch engaging position.

In this way positive engagement of the clutch is maintained since there is no force other than spring 130 normally tending to return the support 131 or looking plunger 137 or anything tending to move rod 119 to the left. In fact the coil spring 118,.see Fig. 2, tends to maintain the rod 119 in clutch engaging position. The rotating dog, however, constitutes the opposition.

After thepower has been supplied to the cam and shaft 102 supporting the same a sufficient length of time the dog 105 again approaches the'pawl 122 and engages the toothed portion 124 thereof. Continued rotation of shaft 102 and therefore dog 105 moves block 120with the rod 119 rigid therewith to the left in opposition to springs 117 and 118 and such movement automatically cams the locking plunger 137 out of groove seating engagement and this movement likewise tilts the rocker 134. Rocker 134 assisted by spring 130 thereupon moves the clutch lever support 131 into'the groove 133 which has by this time moved into registration with said support and the spring 130 then maintains the end of; support 131 in seated relation in the groove or cam portion 133. This movement of the support member 131 automatically shifts the clutch to non-engaging position and the power to the shaft 102 is immediately disconnected until lever 106 is again actuated,to shift the clutch in a reverse direction which actuation of the lever 106 as before described automatically releases the lock construction 105-122 and 126 permitting rotation of the cam 103 when power is supplied after the clutch has been shifted into clutch position by the actuation of lever 106 likewise previously described.

The invention claimed is:

1. In a semi-automatic machine, in combination with a bed, a table rotatable thereon,

manually controlled reciprocation movement starting control for each tool. I,

2. In a semi-automatic machine in combination with a bed, a table rotatable thereon, and a plurality of tools arranged in spaced relation for successive operation upon a piece of work and positioned adjacent thereto, a plurality of work holders arranged in spaced relation upon said table and similarly spaced for simultaneously presenting a plurality of like pieces of work 'to said tools for simultaneous operation upon separate pieces of work and successive openation upon the same piece of work, an independent power operable means for each tool for continuously rotating the same and intermittently reciprocating the same toward and away from the pieces of work, each power operable means being arranged for single cycle automatic operation, and a manually controlled reciprocating movement starting control for each tool.

3. In a semi-automatic machine in combination with a bed, a table rotatable thereon, and a-plurality of tools arranged in spaced relation for successive operation upon a piece of work and positioned adjacent thereto, a plurality of work holders arranged in spaced relation upon said table and similarly spaced for simultaneously presenting a plurality of like'pieces of work to said tools for simultaneous operation upon separate pieces of work and successive operation upon the same piece of work, independent power operable means for each tool for continuously rotating the same and intermittently reciprocating the same toward and away from the pieces of work, each power operable means being arranged for single cycle automatic operation, and a single means for simultaneously initiating the reciprocation of each of said tools.

4C. In a semi-automatic machine in combination with'a. bed, a table rotatable thereon, and a plurality of tools arranged in spaced relation for successive operation upon apiece of work and positioned adjacent thereto, a

4 plurality of work holders arranged in spaced relation upon said table and similarly spaced for simultaneously presenting a plurality of like pieces of Work to said tools for simul- I ta-neous operation upon separate pieces of Work and successive'operation upon the same piece of work, independent power operable means for each tool for continuously rotating the same and intermittently reciprocating the same toward and away from the pieces of work, each power operable means being arranged for single cycle automatic operation, a reciprocation movement starting control, and means remotelyoperable andoperatively associated with each starting control for simultaneously and remotely initiating the reciprocation of each of said tools.

, 5. In a semi-automatic machine in combination with a'bed, a table rotatable thereon, and a plurality of toolsarranged in spaced relation for successive operation upon a piece of work and positioned adjacent thereto, a plurality of work holders arranged in spaced relation upon said table and similarly s aced for simultaneously presenting a plurality of like pieces of work to said tools for simulta; neous operation upon separate piecesof work and successive operation upon the same piece of work, independent power operable means for each tool for continuously rotating the same and intermittently reciprocating the same toward and away from the pieces of Work, each poweroperable means being arranged for single cycle automatic operation, and-a single means for 'simultaneousl initiating the reciprocation movement 0 each of said tools, said single means including a manually operable control member adjacent the loading and unloading station of said machine/ 6. In a semi-automatic machine in combination with a bed, a table rotatable therein, and a plurality of tools arranged in spaced relation for successive operation upon a piece of work and positioned adjacent thereto, a

plurality of work holders arranged in spaced relation upon said table and similarly spaced for simultaneously presenting a lurality of like pieces of work to said tools or simultaneous operation upon separate pieces of work and successive operation upon thesame piece of work, independent power operable means for each tool for continuously rotating the same and intermittently reciprocating the same toward and away from the pieces of work, eachpower operable means being arranged for single cycle automatic operation, each power operable means including a starting control, and means remotely operable and operatively associated with each starting control for simultaneously and remotely initiating the reciprocation of each of said tools,

said single means including a manually operable control member. adjacent the loading and unloading station of said machine.

7. In combination a tool holder capable of rotation and reciprocation, a single source of power therefor, means for rotating the holder and permanently connected to the Source of power for continuous rotation, means for moving said holder in onedirec-- tion for power feeding the same toward 'work, a clutch operatively connecting said moving means to said source of power, a control for, said clutch, means automaticallyoperable by the moving means for disengaging the clutch when predetermined movement of the holder has occurred, and manuall controlled means for actuating said clutc control to engage the clutch.

8. A device as defined by claim 7 characterized by the addition of other means nor mally tending to return the holder to non-' working position andin opposition to which said moving means operates said holder.

9. A device as defined by claim 7 characterized by the addition of other means normally tending to return the holder to non-working position and in opposition to which said moving means operates said holder, said opposing moving means including a pneumatic constructio 1 10. A device as defined by claim 7 characterized by the addition of other means normally ten ing to return the holder to nonworking position and in opposition to which said moving means operates said holder, said opposing moving means including a yielding construction.

11. A device as defined by claim 7 characterized by the addition of other means normallytending to return the holder to non- Kll working position and in opposition to which said moving means operates said holder, said opposing moving means including a pneumatic and yielding construction.

12. A device as defined by calim 7 characterized by the addition of a dash pot construction for cushioningthe return movement ofthe work holder;

13. A device as definedby claim 7 charac-- terized by the addition of other means normally tending to return the holder to nonworking positionand in opposition to which said moving means operates said holder, and the addition of a dash pot construction for normally cushioning the return movement of said work holderI 14. A device as defined by claim 7 characterized by the addition of other means nor mally tending to return the holder to nonworking position and in opposition to which said moving means operates said holder,said opposing moving means including a pneumatic construction, and the addition of a dash pot construction for normally cushioning the return movement of said work holder.

15. A device as defined by claim 7 characterized by the addition of other means normally tending to return the holder to nonworking position and in opposition to which said moving means operates said holder, said opposing moving means including a yielding construction, and the addition of a dash pot construction for normally cushioning the return movement of said work holder.

16. A device as defined by claim 7 char.- acterized by the addition of other means normally tending to return the holderto nonworking position and in opposition to which said moving means operates said holder, said opposing moving means including a pneumatic and yielding construction, and the addition of a dash pot construction for normally cushioning the return movement of said work holder.

17 In combination a tool holdercapable of rotation and reciprocation, a single source of ower therefor, means for rotating the hol er and permanently connected to the source of power for. continuous rotation, means for moving said holder in one direction for power feeding the same toward the work, a clutch operatively connecting said moving means to said source of power, a control for said clutch, means automatically operable by the moving means for disengaging the clutch when predetermined movement of the holder has occurred, manually controlled means for actuating said clutch control to engage the clutch, and a yielding clutch interposed between said source of power and the manually controlled clutch for automatically disconnecting the source of power-from the work holder moving means while the manually controlled clutch is engaged and upon predetermined loading of the tool.

- 18. A device as defined by claim 17 characterized by the addition of other means normally tending to return the holder to nonworking position and in opposition to which said moving means operates said holder.

19. A device as defined by claim 17 characterized by the addition of a dash pot construction for cushioning the return movement of the work holder.

- 20. A device as defined by claim 17 characterized by the addition of other means normally tending to return the holder to nonworking position and in opposition to which said moving means operates said holder, and the addition of a dash pot construction for normally cushioning the return movement of said work holder.

21. In combination a tool holder capable of rotation and reciprocation, a single source of power therefor, means for rotating the holder and permanently connected to the source of power for continuous rotation, means for moving said holder in one direction for power feeding the same toward work, a clutch operatively connecting said moving means to said source of power, a control for said clutch, means automatically operable by the moving means for disengaging the clutch when predetermined movement of the holder has occured, manually controlled means for actuating said clutch control to engage the clutch. and pneumatically operable means arranged to actuate said clutch control.

22. In combination a tool holder arranged for reciprocatory movement, a rotational source of power therefor, cam means operable thereby for causing movement of the holder inone direction, a clutch interposed between said source of power and said cam means, a control for said clutch, and means operable by said cam upon completing a single cycle of rotation for disengaging the clutch.

23. In combination a tool holder arranged for reciprocatory movement, a rotational source of power therefor, cam means operable thereby for causin movement of the holder said source of power and source of able there 1,s49,css 1 in one direction, a clutch interposed between said source of power and said cam means, a control for said clutch, and means for locking said clutch in the disengaged position by said cam means.

24. In combination a tool holder arranged for reciprocatory movement, a rotational source of power therefor, cam means operable thereby for causing movement of the holder in one direction, a clutch interposed between said cam means, a control for said clutch, and a brake automatieally operable by said cam for locking said cam at the end of the cycle movement.

25. In combination a tool holder arranged for reciprocatory movement, a rotational source of power therefor, cam means opery for causing, movement of the holder in one direction, a clutch interposed between said source of power and said cam means, a control for said clutch, means operable by said cam upon completing a single cycle of rotation for disengaging the clutch, means for locking said clutch in the disengaged position by said cam means, and a brake automatically operable by said cam for locking said cam at theend of the cycle movement.

26. In combination a tool holder arranged for reciprocatory movement, a rotational source of power therefor, cam means operable thereby for causing movement of the holder in one direction, a clutch interposed between said source of power and said cam .means, a control for said clutch, means for locking said clutch in the'disengaged position by said cam means, and a manually op erable member for releasing the camoperable clutch lock.

27. In combination a tool holder arranged releasing the cam operable clutch lock and cam operable brake.

29. In combination a tool holder arranged for reciprocatory movement, a rotational source of power therefor, earn means operable thereby for causing holder in one direction, a. clutch interposed between said source of power and said cam means, a control for said clutch, including a shiftable support, a member for shifting said support in one direction, yielding means arranged to shift said clutch in the opposite direction, and means associated with said shifting member for locking said clutch in the clutch engaged position. in opposition to movement of the said yielding means.

30. In combination a tool holder arranged for reciprocatory movement, a rotational source of power therefor, cam means operable thereby for causing movement of the holder in one direction, a clutch interposed between saidsource of power and said cam means, a control for said clutch, including a shiftable support, a member for shifting said support in one direction, yielding means arranged to shift said clutch in the opposite direction, means associated with said shift ng member for locking said clutch in the clutch engaged position in opposition to said yielding means, and means for moving said shifting'member to permit said opposing yielding means to shift said clutch, said shifting member and said locking means being arranged to permit said movement and the latter being arranged upon the shifting of said shitting member for clutch release to positively assist in the shifting of the clutch to for reciprocatory movement, a rotational matically operable by said cam for locking gaged position by said cam .at the end of the cycle movement; and a manually operable member for releasing the cam operable brake.

28. In combination a tool holder arranged; for reciprocatory movement, a rotational source of power therefor, cam means operable thereby for causing movement of the holder in one direction, a clutch interposed I between said source of power and said cam said clutch, means oper- I means, a control for able by said cam upon completing a single power therefor, cam means oper-' cycle of rotation for disengaging the clutch,

means for locking said cam, means, a brake automatically operable by said cam'for locking said cam at .the end of the cycle movesaid clutch in the disen- 'ment, and a manually operable member for' the released position.

In witness whereof, I have hereunto afiixed my signature.

WILLIAM K. MILLHOLLAND.

thereof;

DISCLAI ER MULTIPLE UNIT TURBET .1,849,683.Will13am K. azmzmd; Indianapolis, In

1932. Disclaimgr filed Jqne TYPE MACHINE TOOL. Patent datgd March 15,

10, 1933, by the patentee. 1 Hereby disclaims from Lettrg Pateflt No. 1,849,683, claims 1 to 6, inclusive, 

